The Church of San Cesareo de Appia, commonly and erroneously called San Cesareo in Palatio, is a church in Rome, in the rione Celio, at the port of San Sebastian.
This church is of ancient origins: dates back to the 8th century and was built on the remains of Roman structures, which today can be seen in the underground (remains of a mosaic floor, with scenes of marine 2nd century AD). It is also called from medieval sources San Cesareo in Turrim, "certainly by the proximity of some Tower, of which the city of the Middle Ages was fraught" (Armellini, op. cit., p. 595); with the 16th century also appears the name San Cesareo in Palatio and this created much confusion with the Church of the same name in rione Campitelli.
Over the centuries the Church changed hands several times and was repeatedly renovated: in the 14th century was entrusted to Crociferi to found a ospedaleche gave asylum to the pilgrims entered the nearby Porta San Sebastiano; to them were replaced by the Benedictine nuns; in the 15th century it was entrusted to the care of the nearby church of San Sisto Vecchio and then to the Church of Santi Nereo e Achilleo; was completely restored in the 16th century by Cavalier d'arpino, and then entrusted to the Somaschi Fathers. On this occasion were here transferred to the 13th-century mosaics and other architectural furnishings that were in the transept of the Basilica of San Giovanni in Laterano, at that time undergoing renovations.
The Church has a simple façade with an access door with porch with columns of granite. The Interior has a single nave. The side wall between the Windows, there are mosaics work of Cavalier d'arpino with scenes from the life of San Cesareo. In the apse mosaic that depicts God the father among the angels. The altar, the pulpit, the Chair, the hurdles of the presbytery are architectural elements that belong to the Basilica di San Giovanni: mostly consist of heterogeneous elements dating back to the 13th century.
The organ of the Church of San Cesareo de Appia was built between 1997 and 1999 from Francesco Saverio Chalagalla reusing as an electric organ console and applying multiple system logs. The instrument has two keyboards of 61 notes each and a pedalboard of 32.